Lakshya Education MCQs

Question: The specific fuel consumption of a petrol engine compared to diesel engine of same h.p. is
Options:
A. Same
B. More
C. Less
D. Less or more depending on operating conditions
Answer: Option B
Explanation :

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Question 1. Which one of the following engines will have heavier flywheel than the remaining ones?
  1.     30 kW four-stroke petrol engine running at 1500 r.p.m.
  2.     30 kW two-stroke petrol engine running at 1500 r.p.m.
  3.     30 kW two-stroke diesel engine running at 750 r.p.m.
  4.     30 kW four-stroke diesel engine running at 750 r.p.m.
Answer: Option A
Explanation :
Question 2. The brake power is the power available
  1.     In the engine cylinder
  2.     At the crank shaft
  3.     At the crank pin
  4.     None of these
Answer: Option B
Explanation :
Question 3. In a typical medium speed 4-stroke cycle diesel engine the inlet valve
  1.     Opens at 20° before top dead center and closes at 35° after the bottom dead center
  2.     Opens at top dead center and closes at bottom dead center
  3.     Opens at 10° after top dead center and closes 20° before the bottom dead center
  4.     May open or close anywhere
Answer: Option A
Explanation :
Question 4. The pressure inside the cylinder is _________ the atmospheric pressure during the exhaust stroke.
  1.     Equal to
  2.     Below
  3.     Above
  4.     None of these
Answer: Option C
Explanation :
Question 5. In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the
  1.     Beginning of suction stroke
  2.     End of suction stroke
  3.     Beginning of exhaust stroke
  4.     End of exhaust stroke
Answer: Option A
Explanation :
Question 6. Pick up the false statement
  1.     Thermal efficiency of diesel engine is about 34%
  2.     Theoretically correct mixture of air and petrol is approximately 15:1
  3.     High speed compression engines operate on dual combustion cycle
  4.     S.I. engines are quality governed engines
Answer: Option D
Explanation :

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